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TAS5508APAGG4 Datasheet(PDF) 43 Page - Texas Instruments

Part No. TAS5508APAGG4
Description  8 Channel Digital Audio PWM Processor
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TAS5508APAGG4 Datasheet(HTML) 43 Page - Texas Instruments

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TAS5508A Controls and Status
35
SLES119 − September 2004
TAS5508A
CONTROL
SETTING
Bass filter sets
Filter Set 3
Loudness (5508)
Loudness disabled, default values
AM interference enable
Disabled
AM interference IF
455
AM interference select sequence
1
Tuned freq and mode
0000 , BCD
Subwoofer PSVC control
Enabled
PSVC and PSVC range
Disabled / 0 dB
After the initialization time, the TAS5508A starts the transition to the operational state with the Master volume
set at mute.
Since the TAS5508A has an external crystal time base, following the release of RESET, the TAS5508A sets
the MCLK and data rates and perform the initialization sequences. The PWM outputs are held at a mute state
until the master volume is set to a value other than mute via I2C.
2.2.2 Power Down (PDN)
TheTAS5508A can be placed into the power down mode by holding the PDN terminal low. When power down
mode is entered, both the PLL and the oscillator are shut down. Volume is immediately set to full attenuation
(there is no ramp down). This control uses the PWM mute sequence that provides a low click and pop transition
to the hard mute state (M). A detailed description of the PWM mute sequence is contained in the PWM section.
Power down is an asynchronous operation that does not require MCLK to go into the power down state. To
initiate the power-up sequence requires MCLK to be operational and the TAS5508A to receive 5 MCLKs prior
to the release of PDN.
As long as the PDN terminal is held low the device is in the power down state with the PWM outputs in a hard
mute (M) state. During power down, all I2C and serial data bus operations are ignored. Table 2−3 shows the
device output signals while PDN is active.
Table 2−3. Device Outputs During Power Down
SIGNAL
SIGNAL STATE
Valid
Low
PWM P-outputs
M-state = low
PWM M-outputs
M-state = low
SDA
Signal input
PSVC
M-state = low
Following the application of PDN, the TAS5508A does not perform a quiet shutdown to prevent clicks and pops
produced during the application (the leading edge) of this command. The application of PDN immediately
performs a PWM stop. A quiet stop sequence can be performed by first applying MUTE before PDN.
When PDN is released, the system goes to the end state specified by MUTE and BKND_ERR pins and the
I2C register settings.
The crystal time base allows the TAS5508A to determine the CLK rates. Once these rates are determined,
the TAS5508A unmutes the audio.
2.2.3 Backend Error (BKND_ERR)
Backend error is used to provide error management for backend error conditions. Backend error is a level
sensitive signal. Backend error can be initiated by bringing the BKND_ERR terminal low for a minimum 5
MCLK cycles. When BKND_ERR is brought low, the PWM sets either six or eight channels into the PWM
backend error state. This state is described in the PWM section. Once the backend error sequence is initiated,
a delay of 5 ms is performed before the system starts the output re−initialization sequence. After the
initialization time, the TAS5508A begins normal operation. Backend error does not affect other PWM
modulator operations


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